Prepare an ice-water bath. Place eggs in a medium saucepan.
Add enough cold water to cover eggs by about 1 inch. Bring to a boil. Cover, and remove from heat. Let stand 13 minutes. Drain, and transfer eggs to ice-water bath until cold.
Peel eggs, and halve lengthwise. Transfer yolks to a medium bowl, and mash with a fork until smooth.
Stir in mayonnaise, creme fraiche, wasabi, vinegar, and scallions. Season with salt. Pipe or spoon filling into whites.
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